Fabry-Perot optical fiber sensor for measuring salinity of seawater

The utility model discloses a Fabry-Perot optical fiber sensor for measuring seawater salinity, which comprises a super-continuum spectrum light source, a spectrum analyzer, an optical fiber sensing structure, a micro-flow pump and a waste liquid pool, and the super-continuum spectrum light source, the spectrum analyzer and the optical fiber sensing structure are mutually connected through an optical fiber circulator; the liquid inlet end of the optical fiber sensing structure is connected with the micro-flow pump, the liquid outlet end of the optical fiber sensing structure is connected with the waste liquid pool, and the optical fiber sensing structure is formed by sequentially connecting a single-mode optical fiber, a first capillary optical fiber with a side polishing hole, a grapefruit-shaped optical fiber and a second capillary optical fiber in series. A reflecting surface is formed between every two of the single-mode optical fiber, the first capillary optical fiber with the side-polished hole, the gra